Air in a bicycle pump is forced through a valve at a constant pressure p. In one stroke of the pumpthe volume of air in the pump chamber is reduced from $V_1$ to $V_2$.What is the work done on this air in one stroke of the pump?

1 )
$\frac{P(V_1+V_2)}{2}$
2 )
$P({V_1}+{V_2})$
$P({V_1}-{V_2})$
4 )
$P{V_1}$
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